public class hw10 {
        public static void main(String[] args) {
            printHollowRhombus(6);
        }

        public static void printHollowRhombus(int size) {
            if (size % 2 == 0) {
                size++;// 计算菱形大小
            }
            for (int i = 0; i < size / 2 + 1; i++) {
                for (int j = size / 2 + 1; j > i + 1; j--) {
                    System.out.print("  ");// 输出左上角位置的空白
                }
                for (int j = 0; j < 2 * i + 1; j++) {
                    if (j == 0 || j == 2 * i) {
                        System.out.print("* ");// 输出菱形上半部边缘
                    } else {
                        System.out.print("  ");// 输出菱形上半部空心
                    }
                }
                System.out.println("");     //换行
            }
            for (int i = size / 2 + 1; i < size; i++) {
                for (int j = 0; j < i - size / 2; j++) {
                    System.out.print("  ");// 输出菱形左下角空白
                }
                for (int j = 0; j < 2 * size - 1 - 2 * i; j++) {
                    if (j == 0 || j == 2 * (size - i - 1)) {
                        System.out.print("* ");// 输出菱形下半部边缘
                    } else {
                        System.out.print("  ");// 输出菱形下半部空心
                    }
                }
                System.out.println("");     //换行
            }
        }
    }


